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elli_request.erl
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elli_request.erl
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-module(elli_request).
-include("../include/elli.hrl").
-include("elli_util.hrl").
-export([send_chunk/2
, async_send_chunk/2
, chunk_ref/1
, close_chunk/1
, path/1
, raw_path/1
, query_str/1
, get_header/2
, get_arg_decoded/2
, get_arg_decoded/3
, get_arg/2
, get_arg/3
, get_args/1
, post_arg/2
, post_arg/3
, body_qs/1
, headers/1
, peer/1
, method/1
, body/1
, get_range/1
, get_header/3
, to_proplist/1
, is_request/1
]).
%%
%% Helpers for working with a #req{}
%%
%% @doc: Returns path split into binary parts.
path(#req{path = Path}) -> Path.
raw_path(#req{raw_path = Path}) -> Path.
headers(#req{headers = Headers}) -> Headers.
method(#req{method = Method}) -> Method.
body(#req{body = Body}) -> Body.
peer(#req{socket = Socket} = Req) ->
case get_header(<<"X-Forwarded-For">>, Req, undefined) of
undefined ->
case elli_tcp:peername(Socket) of
{ok, {Address, _}} ->
list_to_binary(inet_parse:ntoa(Address));
{error, _} ->
undefined
end;
Ip ->
Ip
end.
get_header(Key, #req{headers = Headers}) ->
proplists:get_value(Key, Headers).
get_header(Key, #req{headers = Headers}, Default) ->
proplists:get_value(Key, Headers, Default).
get_arg(Key, #req{} = Req) ->
get_arg(Key, Req, undefined).
get_arg(Key, #req{args = Args}, Default) ->
proplists:get_value(Key, Args, Default).
get_arg_decoded(Key, #req{} = Req) ->
get_arg_decoded(Key, Req, undefined).
get_arg_decoded(Key, #req{args = Args}, Default) ->
EncodedValue = proplists:get_value(Key, Args, Default),
list_to_binary(http_uri:decode(binary_to_list(EncodedValue))).
%% @doc Parses application/x-www-form-urlencoded body into a proplist
body_qs(#req{body = Body} = Req) ->
case get_header(<<"Content-Type">>, Req) of
<<"application/x-www-form-urlencoded">> ->
elli_http:split_args(Body);
<<"application/x-www-form-urlencoded;", _/binary>> -> % ; charset=...
elli_http:split_args(Body);
_ ->
erlang:error(badarg)
end.
post_arg(Key, #req{} = Req) ->
post_arg(Key, #req{} = Req, undefined).
post_arg(Key, #req{} = Req, Default) ->
proplists:get_value(Key, body_qs(Req), Default).
-spec get_args(#req{}) -> QueryArgs :: proplists:proplist().
%% @doc Returns a proplist of keys and values of the original query
%% string. Both keys and values in the returned proplists will
%% be binaries or the atom `true' in case no value was supplied
%% for the query key.
get_args(#req{args = Args}) -> Args.
-spec query_str(#req{}) -> QueryStr :: binary().
%% @doc Calculates the query string associated with the given Request
%% as a binary.
query_str(#req{raw_path = Path}) ->
case binary:split(Path, [<<"?">>]) of
[_, Qs] -> Qs;
[_] -> <<>>
end.
-spec get_range(#req{}) -> [http_range()] | parse_error.
%% @doc: Parses the Range header from the request.
%% The result is either a byte_range_set() or the atom `parse_error'.
%% Use elli_util:normalize_range/2 to get a validated, normalized range.
get_range(#req{headers = Headers}) ->
case proplists:get_value(<<"Range">>, Headers) of
<<"bytes=", RangeSetBin/binary>> ->
parse_range_set(RangeSetBin);
_ -> []
end.
-spec parse_range_set(Bin::binary()) -> [http_range()] | parse_error.
parse_range_set(<<ByteRangeSet/binary>>) ->
RangeBins = binary:split(ByteRangeSet, <<",">>, [global]),
Parsed = [parse_range(remove_whitespace(RangeBin))
|| RangeBin <- RangeBins],
case lists:any(fun(parse_error) -> true; (_) -> false end, Parsed) of
true -> parse_error;
false -> Parsed
end.
-spec parse_range(Bin::binary()) -> http_range() | parse_error.
parse_range(<<$-, SuffixBin/binary>>) ->
%% suffix-byte-range
try {suffix, ?b2i(SuffixBin)}
catch
error:badarg -> parse_error
end;
parse_range(<<ByteRange/binary>>) ->
case binary:split(ByteRange, <<"-">>) of
%% byte-range without last-byte-pos
[FirstBytePosBin, <<>>] ->
try {offset, ?b2i(FirstBytePosBin)}
catch
error:badarg -> parse_error
end;
%% full byte-range
[FirstBytePosBin, LastBytePosBin] ->
try {bytes, ?b2i(FirstBytePosBin), ?b2i(LastBytePosBin)}
catch
error:badarg -> parse_error
end;
_ -> parse_error
end.
remove_whitespace(Bin) ->
binary:replace(Bin,<<" ">>, <<>>, [global]).
%% @doc: Serializes the request record to a proplist. Useful for
%% logging
to_proplist(#req{} = Req) ->
lists:zip(record_info(fields, req), tl(tuple_to_list(Req))).
%% @doc: Returns a reference that can be used to send chunks to the
%% client. If the protocol does not support it, returns {error,
%% not_supported}.
chunk_ref(#req{version = {1, 1}} = Req) ->
Req#req.pid;
chunk_ref(#req{}) ->
{error, not_supported}.
%% @doc: Explicitly close the chunked connection. Returns {error,
%% closed} if the client already closed the connection.
close_chunk(Ref) ->
send_chunk(Ref, <<"">>).
%% @doc: Sends a chunk asynchronously
async_send_chunk(Ref, Data) ->
Ref ! {chunk, Data}.
%% @doc: Sends a chunk synchronously, if the refrenced process is dead
%% returns early with {error, closed} instead of timing out.
send_chunk(Ref, Data) ->
case is_ref_alive(Ref) of
false -> {error, closed};
true -> send_chunk(Ref, Data, 5000)
end.
send_chunk(Ref, Data, Timeout) ->
Ref ! {chunk, Data, self()},
receive
{Ref, ok} ->
ok;
{Ref, {error, Reason}} ->
{error, Reason}
after Timeout ->
{error, timeout}
end.
is_ref_alive(Ref) ->
case node(Ref) =:= node() of
true -> is_process_alive(Ref);
false -> rpc:call(node(Ref), erlang, is_process_alive, [Ref])
end.
is_request(#req{}) -> true;
is_request(_) -> false.